<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title></title>
  <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <!-- 生产环境中不建议使用 -->
  <script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
</head>

<body>
  <!-- 容器 -->
  <div id="test"></div>

  <script type="text/babel">
    class Demo extends React.Component {
      state = {isHot:true}
      showData = () => {
        let { input1 } = this;
        alert(input1.value)
      }
      changeWeather = ()=>{
        let {isHot} = this.state;
        this.setState({isHot:!isHot})
      }
      render() {
        let { isHot } = this.state;
        return (
          <div>
            <h2>今天的天气很{isHot ? "炎热":"凉快"}</h2>
            <input ref={(currentNode) => {this.input1 = currentNode;console.log("@",currentNode)}} type="text" placeholder="点击按钮提示数据" /><br /><br />
            <button onClick={this.showData}>点我提示左侧的数据</button>&nbsp;
            <button onClick={this.changeWeather}>改变天气</button>&nbsp;

          </div>
        )
      }
    }

    //2.渲染虚拟DOM到页面
    ReactDOM.render(<Demo a="1" b="2" />, document.getElementById("test"))
  </script>

</body>

</html>
